Reduced benzodiazepinium compounds



United States Patent 3,185,680 REDUCED BENZODIAZEPINIUM COMPOUNDS Peter Hsing-Lien Wei, Upper Darby, Pa., assignor to American Home Products Corporation, New York, N.Y., a corporation of Delaware No Drawing. Filed Oct. 16, 1962, Ser. No. 231,043 3 Claims. (Cl. 260-23945) This invention relates to novel compounds having psychotherapeutic and hypotensive properties and to processes for making such compounds.

More specifically, the present invention is concerned with hydropyrido (1,2-d)(1,4) benzodiazepin-6-(5H)- ones, the letter d being used as shown in the formula below to locate the point of attachment of the pyridine ring to the diazepine ring.

The compounds of this invention may be represented by the formula:

R1 d H il NH ii I wherein R is hydrogen, halogen, haloalkyl or lower alkyl and R is chlorine or hydrogen; and the dotted line between the 10 and 11 carbon atoms indicates that the compounds may be saturated or unsaturated at this position, the saturated compounds being identified by the octahydro designation and the 10-11 unsaturated compounds being identified by the hexahydro designation.

The compounds of this invention are produced by reducing a 5,7-dihydro 6 oxo 6H pyrido(1,2-d) (1,4) benzodiazepinium halide with hydrogen in the presence of a noble metal or noble metal oxide hydrogenation catalyst such as palladium on carbon or platinum oxide to give the corresponding 5,7,8,9,10,11,12,12a-octahydro- 6H-pyrido(1,2-d)(1,4)benzodiazepin-6-one, (III), or by heating in aqueous solution with a 3 to 5-fold excess of sodiumborohydride to form the corresponding 5,7,8,9,- 12,l2a-hexahydro-6H-pyrido(1,2 d) (1,4)benzodiazepin- 6-one (IV). The reactions involved in the preparation of the subject compounds are shown below.

. 0 where R and R are as above stated and X 1s chlorine 7 or bromine.

3,185,680 Patented May 25, 1965 Compounds of Formula II together with methods for their preparation are disclosed and claimed in my copending application Serial No. 230,995, filed even day herewith.

The following examples illustrate the best mode of carrying out the invention.

EXAMPLE I 5,7,8,9,10,11,12,12a-octahydr0-6H-pyrid0(1,2-d) (1,4)

benzodiazepin-6-ione 3.3 g. of 5,7-dihydro-6-oxo-6H-pyrido-(1,2-d) (1,4) benzodiazepinium chloride are dissolved in water (150 cc.) and the solution reduced in a Paar hydrogenator at room temperature (initial pressure 34 lbs.) in the presence of platinum oxide catalyst. The theoretical amount (3 moles) of hydrogen is picked up in 25 minutes. The

used catalyst is filtered off. The filtrate which contains the hydrochloride salt of the reduction product is neutralized with sodium bicarbonate solution. The free amine is a white crystalline material which was recrystallized from methanol, M.P. 203-5 C.

Calc. for C H N O: C, 72.2; H, 7.45; N, 12.95. Fd.: C, 71.92; H, 7.29; N, 13.11.

EXAMPLE II 5,7,8,9,12,12a-hexahydro-6H-pyrialo (1,2-d) (1,4) benzlodliaze pi n-6 sane 3.2 g. of 5,7-dihydro-6-oxo-6H-pyrido-(1,2-d) (1,4) benzodiazepinium chloride are first dissolved in water (:0) A calculated excess of an aqueous solution of sodium borohydride is slowly added. A certain amount of heat is generated. The mixture is heated on a steam bath for a half-hour and then cooled. The light yel low solids are collected and then dried. The crude material is recrystallized from methanol and melted at 205- 8 C.

Calc. for C H N O: C, 73.0; H, 6.60; N, 13.1. C, 72.68; H, 6.57; N, 13.05.

EXAMPLE III Following the procedure of Example I, 2,3-dichloro- 5,7 dihydro 6 oxo 6H pyrid0(1,2 d) (1,4)benzodiazepinium chloride is reduced to 2,3-dichloro-5,7,8,9, 10,11,12,12a octahydro-6H pyrido(1,2d)(1,4)benzo diazepin-6-oue.

EXAMPLE IV Following the procedure of Example II, 2,3-dichloro- 5,7 dihydro 6 oxo 6H pyrid0(1,2 d) (1,4)benzodiazepinium chloride is reduced to 2,3-dichloro-5,7,8,9, 12,12a-hexahydro-6H-pyrido(1,2 (1) (1,4) benzodiazepin- 6-one.

EXAMPLE V Following the procedure of Example I, 2-chloro- 5,7 dihydro 6 oxo 6H pyrido(1,2 d) (1,4)benzodiazepinium chloride is reduced to 2-ch1oro-5,7,8,9, 10,11,12-12a-octahydro 6H pyrido(1,2-d)(1,4)benzodiazepin-6-one.

EXAMPLE VI Following the procedure of Example II, Z-chloro- 5,7 dihydro 6 oxo 6H pyrido(1,2 d)(1,4)benzodiazepinium chloride is reduced to 2-chloro-5,7,8,9, 12,12a hexahydro 6H pyrido (1,2-d)(l.4)benzodiazepin-6-one.

EXAMPLE VII Following the procedure of Example I, 2bromo- 5,7 dihydro 6 oxo 6H pyrid0(1,2 d) (1,4)benzodiazepinium chloride is reduced to 2bromo-5,7,8,9, 10,l1,12,12a-0ctahydro 6H pyrido(l,2-d)(1,4)benzodiazepin-6-one.

3 EXAMPLE vrrr Following the procedure of Example II, 2-bromo- 5,7 dihydro 6 oxo 6H pyrido(1,2 d) (1,4)benzodiazepinium chloride is reduced to 2-bromo-5,7,8,9, 12,12a-hexahydro 6H pyrido (1,2 d)(1,4)benzo diazepin-6-one.

EXAMPLE IX Following the procedure of Example I, Z-trifiuoromethyl-5,7-dihydro 6 x0 6H pyrido(1,2-d)(1,4) benzodiazepinium bromide is reduced to Z-trifluoromethyl-5,7,8,9,10,11,12,12a-octahydro 6H pyrido(1,2- d) (1,4)benzodiazepin-6-one.

EXAMPLE X Following the procedure of Example II, Z-trifiuoromethyl-5,7-dihydro 6 0X0 6H pyrido(1,2-d)(l,4) benzodiazepinium bromide is reduced to Q-trifluoromethyl-5,7,8,9,12,12a hexahydro 6H pyrido(1,2-d) (1,4) benzodiaZepin-G-one.

Solutions, tablets, pills and the like containing, for example, 25, 100, 500 mg. or more of one or more of the present compounds can be made available for symptomatic adjustment of the dosage to the individual patient. Such dosages appear to be well below the toxic dose of the novel compounds of this invention as shown by the acute intravenous LD in mice of one of the compounds falling within the scope of this invention; that is, of 5,7,9,10,11,12,12a 0ctahy dropyrido(1,2-d)(1,4) benzodiazepin-6-one, the preparation of which is given in Example I. The oral LD for this compound is about 800 mg./kg.

4 What is claimed is: 1. A compound having the formula:

HCE /NH wherein the dotted line indicates that the linkage between the 10 and the 11 positions is selected from the group consisting of a single bond and a double bond; R is selected from the group consisting of hydrogen, chlorine, bromine, and trifluoromethyl; and R is selected from the group consisting of hydrogen and chlorine.

2. 5,7,8,9,10,11,12,12a octahydro-6H pyrido( 1,2 d) (1,4)benzodiazepin-6-one.

3. 5,7,8,9,1'2,12a-hexahydro 6H-pyrido-(1,2-d)(1,4) benzodiazepin-G-one.

References Qited by the Examiner Adkins: Reactions of Hydrogen (Wisconsin, 1937), pages 56-67 and 137-138.

Gaylord: Reduction with Complex Metal Hydrides (New York, 1956), pages -102, 789-793, 824 and 966968.

Klingsberg: Pyridine and Derivatives, Fart Two (New York, 1961), page 46.

NICHOLAS S. RIZZO, Primary Examiner.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,185,680 May 25, 1965 Peter Hsing-Lien Wei It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 4, lines 3 to 12, the formula should appear as shown below instead of as in the patent:

Signed and sealed this 10th day of May 1966.

(SEAL) Attest:

ERNEST W. SWIDER EDWARD J, BRENNER Attesting Officer Commissioner of Patents 

1. A COMPOUND HAVING THE FORMULA: 